Cycles material to Blender Render Material
Try Material Utilities Specials. It comes bundled with Blender. You may need to enable it in User preferences / Addons. 

Also note that the recently bundled versions of the addon may not have the ability to convert materials. In this case, just download the addon from the link above and enable the downloaded version instead of the bundled version.

Then, with your objects selected, press Shift + Q to call the Materials Specials Menu -> Specials -> to BI Nodes Off.



Note that you may need to manually add textures you may have used in your material definitions in Cycles.